def _to_png(self, delay=3):
"""Export the HTML to byte representation of a PNG image.
Uses selenium to render the HTML and record a PNG. You may need to
adjust the `delay` time keyword argument if maps render without data or tiles.
Examples
--------
>>> m._to_png()
>>> m._to_png(time=10) # Wait 10 seconds between render and snapshot.
"""
if self._png_image is None:
from selenium import webdriver
options = webdriver.firefox.options.Options()
options.add_argument('--headless')
driver = webdriver.Firefox(options=options)
html = self.get_root().render()
with temp_html_filepath(html) as fname:
# We need the tempfile to avoid JS security issues.
driver.get('file:///{path}'.format(path=fname))
driver.maximize_window()
time.sleep(delay)
png = driver.get_screenshot_as_png()
driver.quit()
self._png_image = png
return self._png_image
def test_geojson(driver):
"""Verify that loading data in GeoJson works well for different use cases.
Prevent two regressions:
- https://github.com/python-visualization/folium/pull/1190
- https://github.com/python-visualization/folium/pull/1289
"""
data_url = 'https://cdn.jsdelivr.net/gh/python-visualization/folium@master/examples/data/search_bars_rome.json'
m = folium.Map((41.9, 12.5), zoom_start=10, tiles='cartodbpositron')
marker_cluster = folium.plugins.MarkerCluster(name='cluster').add_to(m)
folium.GeoJson(data_url, embed=False).add_to(marker_cluster)
folium.GeoJson(data_url, embed=False, show=False, name='geojson').add_to(m)
folium.LayerControl(collapsed=False).add_to(m)
html = m.get_root().render()
with temp_html_filepath(html) as filepath:
driver.get_file(filepath)
assert driver.wait_until('.folium-map')
driver.verify_js_logs()
# Verify the marker cluster is shown, it's a yellow icon with '18' in it.
icon = driver.wait_until('.leaflet-marker-icon.marker-cluster > div > span')
assert icon.text == '18'
# Verify the second GeoJson layer is not shown, because we used show=False.
control_label = driver.wait_until(
'.leaflet-control-layers-overlays > label:nth-of-type(2)'
)
assert control_label.text == 'geojson'
control_input = control_label.find_element_by_css_selector('input')
assert control_input.get_attribute('checked') is None
def get_notebook_html(filepath_notebook, execute=True):
"""Store iframes from a notebook in html files, remove them when done."""
if execute:
subprocess.run([
'jupyter', 'nbconvert', '--to', 'notebook', '--execute', filepath_notebook,
])
filepath_notebook = filepath_notebook.replace('.ipynb', '.nbconvert.ipynb')
html_exporter = nbconvert.HTMLExporter()
html_exporter.template_file = 'basic'
body, _ = html_exporter.from_filename(filepath_notebook)
parser = IframeParser()
parser.feed(body)
iframes = parser.iframes
for iframe in iframes:
with temp_html_filepath(iframe) as filepath_html:
yield filepath_html
def get_notebook_html(filepath_notebook):
"""Store iframes from a notebook in html files, remove them when done."""
# run the notebook to make sure the output is up-to-date
subprocess.run([
'jupyter',
'nbconvert',
'--to',
'notebook',
'--execute',
filepath_notebook,
])
filepath_notebook = filepath_notebook.replace('.ipynb', '.nbconvert.ipynb')
html_exporter = nbconvert.HTMLExporter()
body, _ = html_exporter.from_filename(filepath_notebook)
parser = IframeParser()
parser.feed(body)
iframes = parser.iframes
for iframe in iframes:
with temp_html_filepath(iframe) as filepath_html:
yield filepath_html
def test_heat_map_with_weights(driver):
"""Verify that HeatMap uses weights in data correctly.
This test will fail in non-headless mode because window size will be different.
"""
m = folium.Map((0.5, 0.5), zoom_start=8, tiles=None)
HeatMap(
# make four dots with different weights: 1, 1, 1.5 and 2.
data=[
(0, 0, 1.5),
(0, 1, 1),
(1, 0, 1),
(1, 1, 2),
],
radius=70,
blur=50,
).add_to(m)
html = m.get_root().render()
with temp_html_filepath(html) as filepath:
driver.get_file(filepath)
assert driver.wait_until('.folium-map')
driver.verify_js_logs()
canvas = driver.wait_until('canvas.leaflet-heatmap-layer')
assert canvas
# get the canvas as a PNG base64 string
canvas_base64 = driver.execute_script(
"return arguments[0].toDataURL('image/png').substring(21);", canvas)
screenshot = base64.b64decode(canvas_base64)
path = os.path.dirname(__file__)
with open(os.path.join(path, 'test_heat_map_selenium_screenshot.png'),
'rb') as f:
screenshot_expected = f.read()
if hash(screenshot) != hash(screenshot_expected):
print(screenshot)
assert False, 'screenshot is not as expected'